Steam-boiler



(N0 Model.)

T. H. SEARS.

STEAM BOILER. N0. 309,656. Patented Dee. 23, 1884.

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THOMAS lil. SEARS, OF I-IOLYOKE, MASSACHUSETTS.

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SPECIFICATION forming part of Letters Patent No. 309,656, datedrDecember 23, 1884.

Application filed March 25, 1882. (No modeLl To a/ZZ whom it may concern,.-

Be it known that I, Taoluns H. Salins, a citizen of the United States, residing at Holyoke, in the county of Hampden and State of Massachusetts, haveinvented certain new and useful Improvements in Steam Boilers, of which the following is a specification, reference being had to the accompanying drawings.

lWIy invention relates to horizontal tubular steam-boilers; and the objects of niy invention are, first, to economize in the use of fuel; secondly, to generate a large amount of steam with safety; and, thirdly,l to provide an automatic receiver for scale deposits.

In the drawings, Figure l is a front view of the improved tubular steam-boiler, A being an upper boiler, and B a lower boiler with smaller diameter, E being the lire-grate, and G the water-leg eonnectingthe boilers'A and B.

Fig. 2 is a sectional elevation of my invention, in which D is a large pipe connecting the boilers A and B.

Fig. 3 is a side view of my invention, showing sections of the incasing-wall, ot' which F is a horizontal tile projecting between the boilers A and B from the rear wall, I-I, toward the water-leg O.

Then the improved steam-boiler is in position, it will be incased by a fire-wall, as seen in section in Fig. 3. The hot air will pass from the grate E in through the tubes of the boiler B to the wall H, whence it will be drawn backward and upward under the tile F, outside of the narrow boiler B, as indicated by the arrow L. Turning at the end of the tile F,it will be drawn between the tile F and the lateral surface of the boiler A to the firewall H, whence it will again be drawn backJ ward through the flues of the boiler A, and thence to the chimney. The boiler A projects over the fire-grate E, and the under surface of such projecting part will be heated directly by the tire.

In Figs. 2 and 3, C is a water-leg connected with both boilers A and B, making a receptacle for the scale, which, circulating with the water, will fall down to the bottom of the leg, where it will remain.

I claim as my inventionl. The combination, with two tubular boilers arranged one above the other, the lower boiler being shorter than the upper one, so that a portion ofthe latter is directly over the furnace, of a tile partition extending from the rear casing between said boilers for more than half the length of the lower boiler, leaving an opening at the forward end of the said partition for the passage of the products of combustion, all arranged and operating substan tially as set forth.

2. The combination, with two connected tubular boilers arranged one abovet-he other, the lowerI boiler being shorter than the upper one,and a portion of the latter being directly over the furnace, ot' a water-leg arranged ad` jacent to the .furnace and connected with both of said boilers, and thus adapted to protect the boiler-tubes and to receive the scale deposits, substantially as set forth.

3. The combination, with two connected tubular boilers arranged one above the other. the lower boiler being of lesser diameter and shorter than the upper one, leaving a portion of the latter directly over the furnace, of atile partition extending from the rear casing between said boilers, said partition having an opening at its forward end for the passage of ythe products oi' combustion, and a water-leg arranged adjacent to the furnace and connected with both ot said boilers, and thus adapted to protect the boiler-tubes and to receive the scale deposits, substantially as set forth.

THOMAS II. SEARS. Vitnesses:

JOHN J. BEARDON, F. H. BARBER. 

